Holder for grinding metallurgical samples



Nov. 18, 1952 F. E. RICHARDSON 2,618,108

HOLDER FOR GRINDING METALLURGICAL SAMPLES Filed Oct. 9, 1950 lmentmfkmm/a f. f/o/flwia/m Patented Nov. 18, 1952 HOLDER FOR GRINDINGMETALLURGICAL SAMPLES Frederick E. Richardson, Pittsburgh, Pa.Application October 9, 1950, Serial No. 189,211

1 Claim.

The present invention relates to workpiece holders and more particularlyto a magnetic holder for handling steel specimens being prepared formetallurgical examination and testing.

In the preparation of a steel specimen for spectrographic analysis ormetallographic examination of the surface, it is essential that thesurface of the specimen be properly ground or polished before the samplecan be accurately tested or examined. Belt-type grinders and polishingdiscs are most commonly used in such preparation. When a steel sheet orstrip is to be analyzed or its surface examined, the usual procedure isto first stamp out a small disc of the material on a punch press andthen grind or polish the face of the disc to suit the test to beconducted. Prior to my invention, the handling of the sample while itwas being ground or polished presented considerable difiiculties.Various devices, such as magnets, vacuum cups, etc., have been tried inattempts to overcome these difiicul-ties but the results have not beenentirely satisfactory.

It is, accordingly, an object of my invention to provide a workpieceholder having magnetic and mechanical means incorporated therein forholding a steel sample flatwise while being ground or polishedpreparatory to metallurgical testing or examination.

This and other objects will be more apparent after referring to thefollowing specification and attached drawings, in which:

Figure 1 is a cross sectional elevational View; and

Figure 2 is an end view, with the workpiece removed, looking toward thework-engaging surface of the holder.

Referring more particularly to the drawings, reference numeral 2 refersgenerally to the :assembled device of my invention. Reference numeral 4indicates a cylindrical threaded body having a drilled hole 6 throughthe center thereof and a plurality of permanent magnets 8 set in holesIn in the working end l2 of the cylindrical body 4. The contact ends ofthe magnets 8 are exposed and are set flush with the end l2 of thecylindrical body. Holes In project into the body 4 parallel to its axisand are radially disposed about the drilled hole 6. A sleeve [4 isprovided around the working end I2 of the cylindrical body 4. One end ofthe sleeve I4 is threaded on the inside as at I6 to match the threads onthe cylindrical body 4. The other end of the sleeve is finished smoothon the inside and has an inside diameter of a size to accommodate thediameter of the specimen W to be ground. A lock nut I8 having internalthreads 20 is threaded around the outer periphery of the cylindricalbody 4 adlacent the sleeve 14. The sleeve [4 and the lock nut I 8 haveknurled outer surfaces to permit a firm grip by the operator.

In operation, the cylindrical body member 4, the sleeve l4 and the locknut l8 are loosely assembled, as shown in Figure 1, and a sample disc Wis placed in the sleeve and held securely against the face of the body 4by the magnets 8. The sleeve is then adjusted so that it overlies theworking end 12 of the body 4 but does not overlie the edge of the sampleW. The lock nut 18 is tightened to secure this adjustment. The sampledisc W is thus securely held during grinding, side movement beingrestrained by the sleeve l4 and the magnets 8 holding the discs seatedwithin the sleeve. Upon completion of the grinding or polishing, thesample disc may be readily removed by inserting a rod through the hole 6and pushing the disc away from the magnets. The working ends of both thecylindrical body and the sleeve are accurately finished. Suflicientstock is provided in these members to permit dressing necessitated byaccidental contact with the grinding belt or polishing disc.

While one embodiment of my invention has been shown and described, itwill be apparent that other adaptations and modifications may be madewithout departing from the scope of the following claim.

Iclaim:

A holder to facilitate manipulation of workpieces in the form of thindiscs, comprising a cylindrical body member having a fiat work-holdingface at one end adapted to receive a workpiece thereon, a plurality ofpermanent magnets extending into the body parallel to its axis andspaced radially therefrom, said magnets each having one end positionedflush with the workholding face of said body, a sleeve threaded ontosaid body member with one end thereof adjustably overlying thework-holding face of said body, and a lock nut threaded onto said bodymember adjacent the end of said sleeve remote from said overlying end.

FREDERICK E. RICHARDSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,166,974 DeLeeuw Jan. 4, 19162,179,625 Groden Nov. 14, 1939 2,367,839 Grover Jan. 23, 1945 2,539,532Daniels Jan. 30, 1951

